Media Contact: Mack Burke | Editorial Coordinator | 405-744-5540 | email@example.com. The Delta variant of SARS-CoV-2 emerged from India in late 2020 and has spread across the globe like wildfire by out-competing other variants worldwide. How did it do this? While the exact mechanism is still being studied, this variant tweaked its outer spike protein to better bind to and infect our cells than it ever has before. People infected with Delta have over 1,000 times more virus in their cells than the original strain, making Delta infection spread sooner after exposure than ever before and with much higher amounts of virus, resulting in rapid spread from person-to-person.